Ingot-mold.



H. SUTHANN.

INGOT MOLD.

APPLICATION FILED .IULY 30.19I5.

Patented Oct. 23, 1917.

FIEZ- l Y 1|.II.Il|.lllI.llllllllllllllllllllll I l l l I l I I l .IJ

bww.

H fl Il Il llllllllllllllH H ll/l l l INVENTOR Leash/7a.

To all fuilwm t may concern y Be it known that I, lHARRY SUTHANN, a

citizen of the United States, residing at.

Middletown, .in fthe county of Butler and State of Ohio, have inventedcertain new and useful Improvements in In -ot-Molds, of whichthefollowing is a specication.

My invention -relates to improvements in ingot molds and refers moreparticularly to mold constructions for the purpose 'of preventing pipingand the formation of blow holes in steel ingots.

In attempting to meet the conditions which produce these diiiiculties,various. structure and molds have been employed t involving generally anattempt to provide ,a forced action upon the molten metal .throughaction upon the mold itself. For

instance, it has been proposed to retain the top of the molten metalinthe mold in fluid state by conserving the heat at this portion of themold through the use of a cap, but.

such arrangement necessarily a'ects theescape of the deoxidized. gases,since the em't of such gases is restricted.

It has also been pro osed to provide a rapid cooling action at t e lowerend of the ingot through the use of a cooling agent within the lowerportion of the mold and conserving the heat at the upper end, thus4increasing theA rapidity of the cooling action 'A within that portion ofthe ingot in which piping does not generally form and enabling themolten metal at the top of the ingot to move downwardly as contractiontakes place at the lower end.

In both these forms of' apparatus, the -pur'- pose is to vary the heatradiation provided iby the mold, the differences between the two 'v.Fig. 1, with parts broken away .to indicate forms beingin increasingthevariationin the latter form. These solutions of Ithe diiIiculties arepresumably based upon the premises that the lportion of the- .molten`metal`in contact withthe mold walls solidispond with thedownward'movement of the' central portion as the mass solidiies.

In the resent invention, I aim togreatly reduce, i `not entirelyovercome, this tendency of forming a piping or'the blow holes,

.Speciication of Letters Yatent. I

.x Patented oet. es, 191e.

A application mea July so, i915. serial No. 42,716,

by conservin the heat of the mold walls practically t roughout thelength -of the mold, thereby preventing as far as 4possible materialchilling action on the contacting portions of the molten metal andthe'mold walls, thus tending to materially extend the time ofsolidiication along such walls and thereby permit the metal to solidify.in a normal and gradual manner, so that the solidication more nearlyapproaches uniformity, and. at the same time, permit of the 'escape ofthe deoxidizedgases and prac-` tically prevent the entrance of oxygen.Although this action has the effect to increase .the length of timerequired in solidilicatioii,

this'effect is overcome by reason of the fact that cwastage ofingotisgreatly reduced or eliminated by reason of thereductionor absenceof pipin At thesame time,','the free release of t e gasestends .toprevent the formation of blow holes within the ingot, the solidifyingaction taking place at' a reduced speed. 'Y

A further aim is to of simple type and w ch can be manufactured atrelatively low cost. l

'Io these and other ends, the naturev of which will be readilyunderstood `as the invention is hereinafter disclosed, said inventionIconsists in the improved construction and combination ofpartshereinafter fully described, illustrated in the accompanyingfdrawings,and more particularly pointed out in the appended claims. In thedrawing,

Figure 1 is a side elevation of a mold constructed lin accordance with`my 4invention. f A, e v

Fig. 2 is an elevation at right angles to the sectional construction.` yA Fig'. 3 is a horizontal cross sectional view.. The ingot mold ofthepresentinvention 1s similar in general structural characteristics tothe type of mold usually employed for this purpose,- being in the formofanopenended mold, the inner 'mold walls slightly tapering toward thebottom of the mold to facilitate the stripping action. of the mold,however, .in the present mvention, are increased in thickness over thoseusually employed, this increase belng provided to enable cavities vto beformed therein, these cavities being adapted to receive refractorymaterial. Y

provide an ingot. mold 'lof In the drawing, Vthe mold generally isindicated at 10 and the cavities at 11, the latter being arranged ineach of the walls of the mold, Fig. 3, the cavities extending from thetop of the mold to va point adjacent the mold bottom plane, as shown inFigs. l and 2, the cavities beingof suiiicient width to provide amaterial thickness to the layer of. reractory material which is locatedtherein. For instance, a suitable construction is to provide a wallthickness of five and onehalf inches, a cavity width of two inches, withthe inner plane of the cavity spaced approximately two inches from theinner plane of the wall. rlhis gives an efcient heat insulatingarrangement with a sucient body of material between theinsulating layerand the molten metal to provide the desired results.

While the cavities are necearily closed at their lower ends, this doesnot materially aect the desired operation, since the molds are arrangedon `stools which extend into the lower end-of the mold.

Any desired refractory material may be employed in the cavity, apreferred material being crushed silica brick,l this being a materialwhich will not fuse under the high hats while maintaining the heatinsulating e ects.

As will be understood, the height of the4 lining or liller within. themold wall may depend upon the height of the molten metal within themold. rIhe fact that the cavities are open at their tops, enables anaddition of lining material to be made at any time, and also permits ofa change inthe refractory material by removing the material through suchopen top. v

By arranging the mold walls in this manner, radiation of heat from thewalls is restricted, thus retaining the portion of the wall between thelining and the molten metal at higher temperatures during the solidii:l'ng period. Furthermore, the material of the mold wall between thelining and the molten metal is of a reduced thickness which enables itto reach, the higher temperatures much more rapidly, so that thetendency to solidify on v11'.he.su`riace of the as shown moreparticularly inv freely pass out lties extending from the inname ingotthrough chilling action when contacting with the mold is reduced. 4 t Aswill be obvious, solidication of the ingot takes place at a reducedspeed, thereby permitting the deoxidized gases to of the mold, andpermit the molten metalto take care of the contraction ei'ect in a moreuniform manner'.

1. An ingot mold having an open top and bottom and having a plurality oflongitudinal cavities extending parallel with the interior surfaces ofthe mold wall, said cavities extendil'ig irom the top plane oi the moldto a point adjacent the bottom thereof and acting to produce inner and-outer wall portions approximating the active length of the mold, withsaid inner and outer walls connected at predetermined points, lsaid',7

cavities being adapted to receive heat msulating material, whereby saidwalls will be substantially insulated from each otherb-ut connected'suciently to permit heat conductive relation therebetween to a limitedextent. t

2. An ingot mold having an open top and bottom and having a plurality oflongitudinal cavities extending parallel withfthe in terior surfaces ofthe moldwall, said cavitop plane of Y, the mold to a pointadjacent thebottom thereof and acting to produce inner and outer wall portions'approximating the active length of the mold, with said inner and outerwalls connected at predetermined points, said cavities being ladapted toreceiveheat insulating material, whereby said walls will besubstantially insulated from each other but connected suiiicientlytopermit heat conductive relation therebetween to a limited extent, across section of the mold Walls having its internal contournon-circular, said connections between walls being located at pointswhere heat lconduction isleast effective on the ingot. v L lin testimonywhereof ,in presence' or two witnesses.

Y HARRY SUTHANN.

Witnesses:

Doris lE. Mnnanonn, Hanni; WALBING.

I ailix my signature 5

